JP5791005B2 - Lock ring for fittings - Google Patents

Description

  The present invention relates to a lock ring used for a separation preventing pipe joint such as a water pipe.

  As a pipe joint such as a water pipe, a structure using a lock ring described in Patent Document 1 below is known as a structure for preventing separation accompanying an earthquake or the like.

  As shown in FIG. 6, the lock ring 51 has a tapered ring portion 52 that is split at one place so that the diameter can be expanded and contracted elastically, and a leg that rises in the outer diameter direction on the small diameter end side of the ring portion 52. Three protrusions 53 are provided.

  As shown in FIGS. 7 and 8, the lock ring 51 is formed on the inner periphery of the receiving port 11 in the construction of a pipe joint in which the insertion port 12 of the other tube is inserted into the receiving port 11 of one tube. It is accommodated in the formed lock ring groove 13.

  The lock ring groove 13 is formed between a retaining wall 14 that protrudes toward the inner periphery of the receiving port 11 and a retaining wall 15 on the back side thereof, and the retaining wall 14 is divided at two locations, upper and lower. Further, on the outer periphery of the insertion opening 12 on the opening end side, a retaining protrusion 16 is formed over the entire periphery.

  When the lock ring 51 is set in the lock ring groove 13, the ring portion 52 is bent so that the large diameter side of the ring portion 52 faces the opening side of the receiving port 11 and the diameter of the ring portion 52 is reduced. After the dividing portions of the retaining wall 14 are made to coincide with each other and are made to enter the lock ring groove 13 from the opening side of the receiving port 11 through the dividing portion of the retaining wall 14, the retaining portion 14 is restored by the elasticity of the ring portion 52.

  When the lock ring 51 is housed in the lock ring groove 13 in this way, the large-diameter end of the ring portion 52 abuts against the retaining wall 14 and the leg protrusion 53 abuts against the retaining wall 15, thereby causing the lock ring 51 to move in the tube axis direction. Movement is restricted.

  Thereafter, the insertion port 12 is inserted into the receiving port 11 to a depth at which the retaining protrusion 16 gets over the lock ring 51 and reaches the inner side, and the inner periphery of the opening end of the receiving port 11 and the outer periphery of the insertion port 12 When a rubber ring 17 is interposed between them and a press ring 18 is applied to the flange of the receiving port 11 and is tightened with a tightening member 19 composed of a bolt and a nut, a sealing property is secured.

  With such a pipe joint structure, when a pulling force from the receiving port 11 acts on the insertion port 12 due to an earthquake or the like, the retaining projection 16 of the insertion port 12 abuts on the small diameter end of the ring portion 52 of the lock ring 51. It is prevented from coming off, and damage caused by disconnection of pipes such as water pipes is prevented.

Design Registration No. 1439581

  However, when the lock protrusion 51 is formed by bending the leg protrusion 53 by pressing, if the radius of curvature of the base of the leg protrusion 53 is small, cracks are likely to occur. If the curvature radius is increased, the ring section 52 itself is formed. In addition, a large recessed portion is formed on the end surface on the small-diameter end side of the ring portion 52 including the leg protrusion 53, and a large contact area is ensured between the small-diameter end side of the ring portion 52 and the retaining protrusion 16 of the insertion port 12 when the pulling force is applied. Although it is not possible to cope with the pulling force in particular, there is room for improving the stability of the joint structure.

  Accordingly, an object of the present invention is to obtain a lock ring that can have a more stable joint structure.

  In order to solve the above-described problems, the present invention is used in a pipe joint in which an insertion port is inserted into a receiving port, and is accommodated in a lock ring groove formed on the inner periphery of the receiving port. The opening side of the mouth has a taper shape with a large diameter, and can be elastically expanded and contracted by dividing it at one location, and the ring part is provided with a plurality of leg protrusions that rise in the outer diameter direction, and is stored in the lock ring groove Sometimes, if the large-diameter end of the ring part and the leg protrusion restrict the movement in the tube axis direction, and the pulling force from the receiving port acts on the insertion port, the retaining protrusion on the outer periphery of the insertion port will contact the small-diameter end of the ring part. In connection with the lock ring for a pipe joint in which the insertion port is prevented from coming off from the receiving port, by bending both end portions of the leg projection facing the split portion of the ring portion at an angle inclined with respect to the circumferential direction. The end surface of the leg projection is continuous from the base part of the ring part. It was set to be the end surface of the diameter flush.

  In this lock ring for pipe joints, leg projections facing the split part can be formed on the small-diameter end side of the ring part without causing cracks or recesses due to bending, and in a state of being accommodated in the lock ring groove Since a large contact area can be ensured between the retaining projection of the insertion opening and the small diameter end side of the ring portion when the pulling force is applied, a more stable joint structure can be obtained.

The perspective view of the lock ring for pipe joints concerning this embodiment of the invention (A) Top view and (b) Front view of the lock ring Cross section of pipe joint structure using the same lock ring Same as above Cut perspective view of the joint structure A perspective view of a conventional lock ring for a pipe joint Cross section of pipe joint structure using the same lock ring Same as above

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the lock ring 1 is formed by bending a metal plate such as stainless steel, stainless spring steel, or spring steel coated with anticorrosion coating by pressing, and forming a tapered ring portion 2. In the figure, it is divided at one place in the upper part to make it possible to elastically expand and contract, and the ring part 2 is provided with three leg protrusions 3 rising in the outer diameter direction.

  The leg protrusions 3 are respectively arranged on both sides of the split part of the ring part 2 and on the lower part in the figure, which is opposite to the split part. One leg protrusion 3 in the lower part in the figure and two in the upper part in the figure The leg protrusion 3 is different in formation method and shape.

  One leg protrusion 3 in the lower part of the figure is formed by slightly cutting the ring part 2 on both sides of the base part and bending it in the standing direction. The outer surface excluding the base portion of the leg protrusion 3 is flush with the end surface on the small diameter side of the ring portion 2.

  The upper two leg protrusions 3 in the figure are formed by bending both end portions of the ring portion 2 facing the dividing portion at an angle inclined with respect to the circumferential direction. The end surface of the leg protrusion 3 is flush with the end surface on the small diameter side of the ring portion 2 continuously from the base portion.

  As shown in FIGS. 3 to 5, the lock ring 1, as shown in FIG. 3 to FIG. 5, receives a pipe joint in which the insertion port 12 of the other tube is inserted into the reception port 11 of one tube. It is housed in a lock ring groove 13 formed on the inner periphery of the mouth 11.

  The lock ring groove 13 is formed between a retaining wall 14 that protrudes toward the inner periphery of the receiving port 11 and a retaining wall 15 on the back side thereof, and the retaining wall 14 is divided at two locations, upper and lower. Further, on the outer periphery of the insertion opening 12 on the opening end side, a retaining protrusion 16 is formed over the entire periphery.

  When the lock ring 1 is set in the lock ring groove 13, the ring portion 2 is bent so that the large-diameter side of the ring portion 2 faces the opening side of the receiving port 11 and the diameter of the ring portion 2 is reduced. After being made to coincide with the divided portion of the retaining wall 14 and entering the lock ring groove 13 from the opening side of the receiving port 11 through the divided portion of the retaining wall 14, it is restored by the elasticity of the ring portion 2.

  When the lock ring 1 is housed in the lock ring groove 13 in this way, the large-diameter end of the ring portion 2 abuts against the retaining wall 14 and the leg protrusion 3 abuts against the retaining wall 15. Movement is restricted.

  Thereafter, the insertion port 12 is inserted into the receiving port 11 to a depth at which the retaining projection 16 gets over the lock ring 1 and reaches the inner side of the lock ring 1, and the inner periphery of the opening end of the receiving port 11 and the outer periphery of the insertion port 12 When a rubber ring 17 is interposed between them and a press ring 18 is applied to the flange of the receiving port 11 and is tightened with a tightening member 19 composed of a bolt and a nut, a sealing property is secured.

  With such a pipe joint structure, when a pulling force from the receiving port 11 acts on the insertion port 12 due to an earthquake or the like, the retaining protrusion 16 of the insertion port 12 is on the small diameter end side of the ring portion 2 (the ring portion 2 itself and the leg). (Consisting of the base of the protrusion 3) is brought into contact with the lock ring 1 and is prevented from coming off, and damage caused by disconnection of a pipe such as a water pipe is prevented.

  Further, when the lock ring 1 is manufactured, the leg protrusion 3 facing the split portion can be formed on the small-diameter end side of the ring portion 2 without causing a crack or a recessed portion due to bending, and the lock ring 1 is received. Since the contact area between the retaining protrusion 16 of the insertion opening 12 and the small-diameter end side of the ring portion 2 can be secured in a state of being accommodated in the lock ring groove 13 of the opening 11, more stable. A joint structure can be obtained.

DESCRIPTION OF SYMBOLS 1 Lock ring 2 Ring part 3 Leg protrusion 11 Receiving port 12 Insertion port 13 Lock ring groove 14 Retaining wall 15 Retaining wall 16 Retaining protrusion 17 Rubber ring 18 Push ring 19 Tightening member

Claims (1)

  Used in a pipe joint in which the insertion port (12) is inserted into the receiving port (11), and is accommodated in a lock ring groove (13) formed on the inner periphery of the receiving port (11). 2) is tapered so that the opening side of the receiving port (11) has a large diameter, and can be expanded and contracted elastically by dividing it at one location, and a plurality of legs rising in the outer diameter direction on the ring part (2) Protrusion (3) is provided to restrict movement in the tube axis direction between the large diameter end of the ring part (2) and the leg protrusion (3) when stored in the lock ring groove (13). When a pulling force is applied from the receiving port (11), the retaining protrusion (16) on the outer periphery of the insertion port (12) comes into contact with the small-diameter end of the ring part (2), and the insertion port (12 In the lock ring (1) for a pipe joint that is prevented from coming off, bend both ends of the leg protrusion (3) facing the split part of the ring part (2) at an angle inclined with respect to the circumferential direction. The end surface of the leg projection (3) is connected from the base. Lock ring for pipe joints, characterized in that as the end surface flush the small diameter side of the Ring portion (2).

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